Cambridge International AS & A Level
PHYSICS
9702/31
Paper 3 Advanced Practical Skills 1
May/June 2021
CONFIDENTIAL INSTRUCTIONS
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This document gives details of how to prepare for and administer the practical exam.
The information in this document and the identity of any materials supplied by Cambridge International
are confidential and must NOT reach candidates either directly or indirectly.
The supervisor must complete the report at the end of this document and return it with the scripts.
INSTRUCTIONS
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If you have any queries regarding these confidential instructions, contact Cambridge International
stating the centre number, the syllabus and component number and the nature of the query.
email
info@cambridgeinternational.org
phone
+44 1223 553554
This document has 8 pages. Any blank pages are indicated.
DC (MS/CT) 198587/2
© UCLES 2021
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General information about practical exams
Centres must follow the guidance on science practical exams given in the Cambridge Handbook.
Safety
Supervisors must follow national and local regulations relating to safety and first aid.
Only those procedures described in the question paper should be attempted.
Supervisors must inform candidates that materials and apparatus used in the exam should be treated
with caution. Suitable eye protection should be used where necessary.
Before the exam
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The packets containing the question papers must not be opened before the exam.
It is assumed that standard school laboratory facilities, as indicated in the Guide to Planning
Practical Science, will be available.
Spare materials and apparatus for the tasks set must be available for candidates, if required.
During the exam
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It must be made clear to candidates at the start of the exam that they may request spare materials
and apparatus for the tasks set.
Where specified, the supervisor must perform the experiments and record the results as instructed.
This must be done out of sight of the candidates, using the same materials and apparatus as the
candidates.
Any assistance provided to candidates must be recorded in the supervisor’s report.
If any materials or apparatus need to be replaced, for example, in the event of breakage or loss,
this must be recorded in the supervisor’s report.
After the exam
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The supervisor must complete a report for each practical session held and each laboratory used.
Each packet of scripts returned to Cambridge International must contain the following items:
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the scripts of the candidates specified on the bar code label provided
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the supervisor’s results relevant to these candidates
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the supervisor’s reports relevant to these candidates
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seating plans for each practical session, referring to each candidate by candidate number
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the attendance register.
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Specific information for this practical exam
The supervisor must be a teacher of physics or other competent physicist who is familiar with the
requirements of this syllabus. During the exam, the supervisor (not the invigilator) should obtain
a sample set of numerical results by following the relevant steps in the question paper. The results
should be clearly labelled ‘supervisor’s results’ and recorded on the supervisor’s report or on a
spare copy of the question paper.
Organisation of the exam
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The number of sets of apparatus provided for each experiment should be 1 N, where N is the
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number of candidates taking the exam.
Candidates must not be provided with any additional apparatus beyond that specified in these
instructions.
Candidates should be allowed access to the apparatus for each experiment for one hour only.
After spending one hour on one experiment, candidates should change over to the other
experiment.
The order in which a candidate attempts the two experiments is immaterial.
Assistance to candidates
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Candidates should be informed that, if they find themselves in real difficulty, they may ask the
supervisor for practical assistance, but that the extent of this assistance will be reported to the
examiner, who may not award full credit for the relevant skills.
Assistance should only be given when it is asked for by a candidate or where apparatus is seen to
have developed a fault.
Assistance should be restricted to enabling candidates to make observations and measurements.
Observations and measurements must not be made for candidates, and no help should be given
with data analysis or evaluation.
In cases of faulty apparatus that prevent the required measurements from being taken, the
supervisor should allow extra time to give the candidate a fair opportunity to perform the experiment
as if the fault had not been present.
Any assistance or extra time given to candidates must be recorded in the supervisor’s report.
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Materials and apparatus for Question 1 (per set of apparatus unless otherwise specified)
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Stand of height at least 60 cm.
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Boss.
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Clamp.
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Wooden metre rule with a millimetre scale.
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30 cm ruler with a millimetre scale.
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180° protractor with 1° divisions.
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Expendable spring with approximate outside diameter 15 mm, approximate coiled length
20 mm and approximate spring constant 25 N m−1 (e.g. Philip Harris product code B8G87194).
See Note 1.
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Two string loops. See Note 1.
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100 g slotted mass with its mass value clearly labelled.
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Two 50 g slotted masses with their mass values clearly labelled.
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Three 10 g slotted masses with their mass values clearly labelled.
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10 g mass hanger with its mass value clearly labelled. See Note 2.
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1 g of adhesive putty (e.g. Blu-Tack).
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Small tray for the adhesive putty.
Notes
1
A string loop of approximate circumference 15 cm should be attached to the spring as shown in
Fig. 1.1.
Fig. 1.1
Another separate string loop of approximate circumference 30 cm should also be provided.
2
It must be possible to fit all the slotted masses on the 10 g mass hanger.
3
The apparatus should be laid out on the bench. If the apparatus is to be used by another candidate,
then it should be restored to its original state. The adhesive putty should be returned to the small
tray.
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Materials and apparatus for Question 2 (per set of apparatus unless otherwise specified)
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Long-stem thermometer with a range of −10 °C to 110 °C reading to the nearest 1.0 °C or 0.5 °C.
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Stop-watch reading to 0.1 s or better.
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30 cm ruler with a millimetre scale.
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Cup. See Note 1.
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Access to a source of boiling water e.g. a kettle (may be shared between up to six candidates).
See Note 2.
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Access to a sink.
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Access to paper towels.
Notes
1
The cup should be a household item with or without a handle. It should be made from an opaque
material, such as plastic or ceramic, and be able to withstand boiling water. It should be able to
contain 300 cm3 to 400 cm3 of water when filled to the top. It should have a circular cross-section
and have sloping sides with approximate dimensions as shown in Fig. 2.1.
. 8 cm
. 10 cm
. 5 cm
Fig. 2.1
2
Candidates should be made aware of the dangers of working with boiling water.
3
The apparatus should be laid out on the bench. If the apparatus is to be used by another candidate,
then it should be restored to its original state. A new cup should be supplied.
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BLANK PAGE
Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every
reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the
publisher will be pleased to make amends at the earliest possible opportunity.
To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge
Assessment International Education Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download
at www.cambridgeinternational.org after the live examination series.
Cambridge Assessment International Education is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of the University of
Cambridge Local Examinations Syndicate (UCLES), which itself is a department of the University of Cambridge.
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Supervisor’s report
Syllabus and component number
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Centre number
Centre name ............................................................................................................................................
Time of the practical session ...................................................................................................................
Laboratory name/number ........................................................................................................................
Give details of any difficulties experienced by the centre or by candidates (include the relevant
candidate names and candidate numbers).
You must include:
● any difficulties experienced by the centre in the preparation of materials
● any difficulties experienced by candidates, e.g. due to faulty materials or apparatus
● any specific assistance given to candidates.
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Declaration
1 Each packet that I am returning to Cambridge International contains all of the following items:
● the scripts of the candidates specified on the bar code label provided
● the supervisor’s results relevant to these candidates
● the supervisor’s reports relevant to these candidates
● seating plans for each practical session, referring to each candidate by candidate number
● the attendance register.
2 Where the practical exam has taken place in more than one practical session, I have clearly
labelled the supervisor’s results, supervisor’s reports and seating plans with the time and laboratory
name/number for each practical session.
3 I have included details of difficulties relating to each practical session experienced by the centre or
by candidates.
4 I have reported any other adverse circumstances affecting candidates, e.g. illness, bereavement or
temporary injury, directly to Cambridge International on a special consideration form.
Signed ................................................................................................................................. (supervisor)
Name (in block capitals) ..........................................................................................................................
© UCLES 2021
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